Fetchling has the ability to get 50% concealment instead of 20% in dim light. Does Darkvision beat this?

Shadow walker itself benefits from Dim Light and darker illuminations. Would the Shadow Walker gain any benefits against a darkvision character or does Darkvision trump the entire archetype making it worthless, as 75% of the monsters we tend to fight have Darkvision. The campaign this character would be going into is Mummy's Mask, a very undead oriented campaign at least at the start, and they all have Darkvision.

Dim light (or natural darkness) does not provide any concealment against a creature with darkvision (see "Ignoring Concealment" here), but Shadow Walker's archetype abilities are not dependent on whether you have concealment or not. Whether you are seen by other creatures or not, it doesn't change the illumination level of the area you're in. The abilities work as normal.

Being a fetchling is not a class feature of the shadow walker archetype, so no, darkvision does not negate any class features of the shadow walker archetype. ie, the shadow walker still gets init bonuses, SLA's etc associated with the class. The use of the SLA's against creatures with darkvision will be of a more limited use though, as simply casting darkness will have no effect on them. Though deeper darkness, or daylight may have effect on them.

Darkvision does counter the fetchling Shadow Blending racial ability though as it removes the miss chance associated with dim lighting.

Alright. now in using these tactics against the enemy, they'd just negate it....so all in all it is better (Fetchling or not) to use this in a game not so dominated by Darkvision characters WHICH is rare as can be.

A creature in dim light has 20% concealment. It has that concealment even if all of its opponents have darkvision and ignore the concealment. The concealment is something the creature has when in dim light.

A Fetchling in dim light has concealment even if some or all of its opponents have darkvision. The opponents with darkvision ignore the 20% concealment but don't ignore the 50% concealment from Shadow Blending because darkvision doesn't say that it ignores supernatural abilities, just that it ignores the concealment from dim light.

That's my 2cp. Darkvision ignores the concealment from lighting but not from other sources. Can definitely see how a GM could rule it the other way though.

A creature in dim light has 20% concealment. It has that concealment even if all of its opponents have darkvision and ignore the concealment. The concealment is something the creature has when in dim light.

A Fetchling in dim light has concealment even if some or all of its opponents have darkvision. The opponents with darkvision ignore the 20% concealment but don't ignore the 50% concealment from Shadow Blending because darkvision doesn't say that it ignores supernatural abilities, just that it ignores the concealment from dim light.

That's my 2cp. Darkvision ignores the concealment from lighting but not from other sources. Can definitely see how a GM could rule it the other way though.

Concealment, or lack of, is on a per opponent basis. It is a question of perspective. Dim light provides no concealment against anyone with Darkvision.

Compare and contrast with the Shadowdancer ability Hide in Plain Sight(SU), which does not require the user to have concealment, but only to be within 10' of dim light.

Vision and Light wrote:

In an area of dim light, a character can see somewhat. Creatures within this area have concealment (20% miss chance in combat) from those without darkvision or the ability to see in darkness

Fetchling has the ability to get 50% concealment instead of 20% in dim light. Does Darkvision beat this?

Shadow walker itself benefits from Dim Light and darker illuminations. Would the Shadow Walker gain any benefits against a darkvision character or does Darkvision trump the entire archetype making it worthless, as 75% of the monsters we tend to fight have Darkvision. The campaign this character would be going into is Mummy's Mask, a very undead oriented campaign at least at the start, and they all have Darkvision.

No, Darkvision doesn't harm this class at all. Your looking at it wrong. This is like a Ranger Favored terrain, except the terrain is light levels. You can focus on being in Normal Light or Bright Light with this archetype just as much as you could focus on being in Dim Light or Darkness. And unlike the ranger, this class has options to manipulate the "terrain" into their specialized one. Class is focused on light manipulation, so you could shift the light level to one more suited for you (or your party).

If the plan is Mummy's Mask, I'd focus on being in Bright Light and getting yourself a party that spams Daylight. Or just Normal Light. Sure, no concealment in Bright Light or Normal Light, but you can still get sneak attack with flanks or could take Catch Off Guard while wielding Torches (which is a light source, after all).

Additionally, this class gains substancial darkvision bonuses and has the ability to negate light sensitivity, so could go with a Dwarf with Minesight (120ft Darkvision and light Sensitivity) and lose Light Sensitivity by 3rd and have 140ft Darkvision by then. Should allow you to spot enemy undead in darkness long before they have noticed you.

Oh, additionally, even if Undead have Darkvision, the drawback to darkvision is that it cuts off at it's listed range, which is often only 60ft. This archetype granting bonuses to the max range of darkvision means that you can often see them when they are unable to see you (granting you total concealment in darkness). I believe there are some Rogue Talents to increase the range sneak attack can be delivered from. Seems useful if you can get sneak attack to 70ft which should give you 10ft to stand it and shoot from against most creatures relying on darkvision.

I believe there are some Rogue Talents to increase the range sneak attack can be delivered from. Seems useful if you can get sneak attack to 70ft which should give you 10ft to stand it and shoot from against most creatures relying on darkvision.

Sniper Goggles are the best bet. There is a Rogue and Slayer archetype (both named the Sniper) that can extend sneak attack range, but both have rather annoying limitations that make them ineffective at their intended goal. Sniper Goggles are expensive, but they fix the problem completely.

Dim Light as a rule system is horrible. There is no way to adjudicate it properly. Sometimes "the base" matters (Hide in Plain Sight-Shadowdancer) (this is true even though there is no such base illumination as dim light as both a light source and something blocking it must occur for dim light to exist). Sometimes "the perceiver" matters (Stealth). And sometimes "it's magic" matters (Shadow Walk).

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